Thanks for all the replies about single-flonum uses! I've pushed the change to try out disabling single-flonum literals as of v7.3.0.5.
Note that this change doesn't remove the concept of single-flonum values from the language. It just removes single-flonum literals from `#lang racket` and other languages that use the S-expression reader. If you have a program with a single-flonum literal expression in it, such as 3.4f5 then you can convert to a use of `real->signle-flonum`: (real->single-flonum 3.4e5) On a Racket variant that supports single-flonum values (like the current version of Racket), the compiler will constant-fold that expression to a single-flonum value, so the compiled code is the same as writing a single-flonum literal. On a Racket variant that does support single-flonum values, however, that expression will raise an exception. Here's an example in `degrees->radians` in `racket/math`: https://github.com/racket/racket/blob/master/racket/collects/racket/math.rkt#L97 The call to `real->single-flonum` is in a `cond` clause that is guarded with a `single-flonum?` test. Obviously, that guard will succeed only in a Racket variant that supports single-flonum values, so we don't need to worry about the `real->single-flonum` operation failing. For cases where there's no natural `single-flonum?` guard, a new `single-flonum-available?` function reports whether single-flonum values are supported. It currently produces #t in the current version of Racket and #f in Racket CS. Finally, you can set the new `read-single-flonum` parameter to #t to restore single-flonum parsing at the level of `read`. You can set `read-single-flonum` to #t on Racket variant that does not support single-flonum values, but `read` will raise an exception if it encounters a single-flonum number. Although we could make a language or a language constructor that enables single-flonum literals by setting `real-single-flonum`, I think we should try discouraging that, for now. Admittedly, I used a little reader to do that in the test suite for the core single-flonum operations, but that feels like a special case. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/5cf66da2.1c69fb81.baabf.95f9SMTPIN_ADDED_MISSING%40gmr-mx.google.com. For more options, visit https://groups.google.com/d/optout.
